Aperture lost some of my videos

Hey guys I am new to this forum and I need some help. I just realized that Aperture lost some of my videos.I see the thumbnail in Aperture but when I click the thumbnail of the video it doesn't play. When I control click to Show In Finder it tell me "The file IMG_0835.MOV could not be found because the volume on which it resides is currently offline. Volume: Macintosh HD." I never put these file on an external drive they all should be on my Macs hard drive. What do I do now? I am Running Mavericks

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